James brookhotjse preston



(No Model.) 2 Sheets-Sheet L J. B. PRESTON.

LATHE.

Patented Jan. 13, 1891..

mi. I \N\ L @NX @Q m 5% 1N 92mm 22222, 2:2 22, 2 m m N M, mm E 4 @v 4 W@ L Il x Q A.. "N la# Q P 0 2Q w It@ N .h

2 Sheets-Sheet 2.

v0 m1 S. Em RM PL DD J.

No m. E 1W m n .d ,w ...lu a D..

.f -ab V N m II.. Irl u Ih r H #Nl o o R M smi a I. VHN? .RF E .M, MH :Q o v M uw m. me i@ UNITED STATES trice.

PATENT JAMES BROOKIIOUSE PRESTON, OF DARLINGTON, ASSIGNOR OF ONE-HALF TO JOI-IN SANDROCOTTA MARSHALL AND FRANCIS COTTON, BOTH OF SYDNEY, NEIN SOUTH VALES.

LATHE..

SPECIFICATION forming part of Letters Patent No. 444,799, dated January 13, 1891. v Application filed March 5, 1890. Serial No. 342,764. (No model.) Patented in New South Wales April 3, 1889,1l'0I 1,337.

.To aZZ whom it may concern:

Be it known that I, JAMES BRooKHoUsn PRESTON, engineer, a subject of the Queen of Great Britain, residing atA Darlington, near Sydney, in the British Colony of New South yValeS, have invented certain new and useful Improvements in Turning-Lathes, (for which I have obtained Letters Patent in New South lVales, dated April 3, 1889, No. 1,3375) and I do hereby declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

The invention relates to that class of machines more especially designed for turning irregular forms, and commonly known as copying-lathes, and has for its object to provide a cheap, effective, and economicallyworked machine or lathe for turning irregular forms.

To these ends the invention consists in structuralfeatures and combinations of parts, as will now be fully described, reference being had to the accompanying dra-wings, in which- Figure l is a side elevation. Fig. 2 is a top plan view. Fig. 3 is a left-hand end elevation, and Fig. a is a section taken on or about on line a a of Fig. l.

The operative mechanism of the machine is mounted upon a suitableframe-work A and A the lower portion A of which has bearings for the main driving-shaft A2, that carries pulleys A"l A1l and A5, the pulley A1 L being belted to any suitable prime motor.

The pulley A5 is connected by a belt a5 with a pulley on the cutter-shaft E3, which will presently be referred to, and the pulleyA4, which is a cone-pulley, as shown in dotted lines in Fig. l and full in lines in Fig. 3, is belted to a like pulley Bs on a transmitting-shaft B6, parallel with shaft A2, said shaft B( having its bearings B'T also in the lower portion A of the framing A. The shaft B6 carries at each end a belt-pulley B11t B13, respectively. The belt-pulley B14 is connected by a straight belt B11 with the fast pulley b9 of a pair, of

which B9 is the loose pulley, mounted on the left end of a screw-shaft B, which at its right end carries a like pair of pulleys blo B10, the fast pulley hlobeing shown as belted with the pulley B13 on shaft BG by a crossed belt B12. The shaft B has its bearings B secured to the upper portion of the framing A and revolves freely in bearings C C2, depending from the under side of a carriage C, thatA has bearings Cl and C5 and the h`ead-stock C15, for purposes presently to be explained. At its left end the shaft B is provided with a key-groove B2, into which takes a key or feather formed on a coupling-sleeve B4, that is loosely mounted on the shaft B, and upon said sleeve is keyed a gear-wheel B5, that meshes with a like wheel C6, keyed to the pattern C3. The flange h4 of the sleeve B4 is in perpetual engagement with a locking-groove c4, formed in the under side of the carriage C, (see Fig. 1,) or in the enlarged head of one of the bolts or one of the straps that serve to secure the bearing C4 to said carriage, thus locking the wheel B5 to the carriage C, so that it will partake of its traversing` motion. At its right-hand. end the shaft B is `screwthreaded, as shown at B3, Figs. 1 and 2, and works in bearing C2 of carriage C, which is interiorly screw-threaded and imparts to said carriage its traversing motion. It has been stated that the shaft B revolves freely in its bearings on the carriage, which is thus pivotally mounted on said shaft, and has an arm C10, Fig. 2, on which is mounted a weight C10, said arm projecting from the pattern-guido and cutter side of the carriage, so as to maintain the pattern in Contact with said guide, and the material worked in contact with the cutter or tool.

From the description of the driving mecl1- anism for the shaft B it will be readily understood that the traversing motion of the carriage C may be reversed whenever it reaches the limit of such mot-ion in one direction..

The machine illustrated in the drawings is more especially designed for turning wheelspokes, and I will describe the remaining IOO lasts, fc-by .providing suitable patterns and cutting-tools. The pattern (53 revolves freely in the bearings CA1 (l5 on carriage C, above referred "to, and is provided with a suitable centering device C7, and at its opposite end carries the gear-wheel C5 that meshes with and is revolved by gear-wheel B5 on shaft B, hereinabove described, the woodnainely, the blank to be turned-being centered on the said pattern end and on an ordinary lathe center or centering-screw C8, adjustable in the head-stock C15. '.lhe patternguide D revolves freely with its shaft in bearings D', that are adjustable by means of bolts D2 toward and from the pattern C5, and E is the cutter-disk, to which are adjustably secured a series of cutters E by means of bolts E2. The cutter-disk E is secured to a shaft E2, that has its bearings E'l in standards secured to the training A, and said shaft carries the pulley IE5 aforementioned belted to pulley A5 on shaft A2.

In operation, motion being imparted to counter-shaftA2,thecounter-shaft Biscaused to revolve by belt around pulleys A'L and B5,

and the spindle E5 is likewise revolved by.

belt around pulleys A5 and The wheelspoke pattern C5 having been previously cast of metal, the wheel C is keyed onto its end, and it is passed th rough or l'aid in headstocks C* and C5, the blank F placed in its clutch or against its centering` devices Cl, and the hand-wheel C2 turned so that itis grasped in the centers. The belts B11 and B12 are so manipulated that one of them is, when -required, placed over the fast pulley'b or blo of either of the pairs of fast and loose pulleys on shaft B, and so cause said shaft to revolve, giving similar motion through wheels B5 and C6 to the pattern and the blank. rlhe Athreaded portion B3 of shaft B, revolving in the nut-bearing C2, gives longitudinal motion to the carriage C and parts supported thereby, as well as to gear-wheel B5 on shaft B, as above explained. The gouges or cutters E are retained in their sockets in the revolving; holder or disk E by set screws or bolts E2, andthey are adjusted according to the adjustment of the guide D relatively to the pattern C5. lAs the tools E revolve and the bed C rtravels longitudinally backward and forward the blank F takes the forni of the pattern C5, for the weight C10 tends to keep the bed inclined over, so that the pattern C2 always has a hard but elastic pressure on the guide D.

Having thus described my invention, what I claim is l. In a lathe for turning irregular forins, the combination, with the pattern provided at one end with a centering device, a gearwheel rigidly secured to the opposite end of said pattern, and a head-stock provided with a centering-screw in the saine straight line as the centering device on the pattern, of a revoluble shaft with which said parts are pivotally connected and on which they have end- 2, In a lathe for turning irregulaiyforms, the g combination, with the pattern provided at one end with a centering device, a gear-wheel rigidly secured tothe pattern at its opposite end, and a head-stock provided with a centeringscrew in the saine straight line as the centering device on the pattern, of a revoluble shaft with which said parts are pivotally connected and on which they have endwise motion, a gear-wheel adapted to revolve with the shaft and to have endwise motion thereon with the pattern, said gear-wheel being in perpetual gear with the like wheel on said pattern, a lpattern-guide having a fixed position relatively to the pattern, and a weight arranged to exert power on the pat-tern and head-stock and tilt the same toward the pattern-guide, for the purpose set forth.

3. In a lathe for turning irregular fornis, the combination bf the shaft B, screw-threaded at one end andfprovided with a longitudinal key-groove at the opposite end,the couplingsleeve B4, having annular flange 1, and the gear-wheel B5 on said sleeve, with the carriage C, provided with a groove c4 for the reception of [lange h1 on coupling-sleeve B4, the

bearings C C2 at orosite ends of the cars lP riage, said bearing C2 being screw-threaded interiorly, the pattern C3, revoluble in bearings on the carriage, the wheel O5 on said pattern and in gear with wheel B5 on shaft B, and the head-stock C15, secured to said carriage and having its lathe center in the horizont-al axial plane of the like center on one end of the pattern, substantially as and for the purposes set forth.

4. In a lathe for turning irregular forms, the combination of the shaft B, screw-threaded at oneend and provided with a longitudinal key-groove at the opposite end, the couplingsleeve B4, having annular flange b4, the gearwheel B5 on said sleeve, a revoluble patternguide, and a revoluble cutter-disk E, carrying cutters t", arranged on the one side of shaft B, with the carriage C, provided with a groove c4 for the reception of flange b4 on coupling-sleeve B4, the bearings C C2 at opposite ends of the carriage, said bearing C2 being screw-threaded interior-ly, the pattern C2, revoluble iii-bearings on the carriage, the gear-wheel C5 on said pattern and in gear with wheel B5 on shaft B, and the head-stock C15, secured to said carriage and having its lathe center in the horizontal axial plane of the like center on one end of the pattern, and a weighted arm 010, secured to the carriage on the side of said guide and cutter-disk, substantially as and for the purposes set forth. l

5. In a lathe for turning irregular forms,the combination, with the shaft B, the gear-wheel B5 thereon and a pair of fast and loose pul- IOC IIO

leys at each end thereof, the carriage C, the with pulley E5 on cutter-sl1aft E3 and with pattern C3, the gear-whee1 C6 ou said pattern pulley B,S on transmittdngshaft B6, substan- Io in gear' with the wheel B5 on shaft B, and the tially as and for the purposes set forth.

shaft E3, carrying L pulley E5, of the orausmit- JAMES BROOKHOUSE PRESTON. ting-shaft B, its belt-pulleys B13 B14, belted Witnesses:

by crossed and straight belts with pulleys ou FRED WALSH,

shaft B, the main driving-shaft; A2, and the F. lll. Inst. P. A.

pulleys A4 A5 thereon, belted, respectively, THOMAS J. WARD. 

